5.4.7. Routine inspection and maintenance Since the state of turbocharger depends largely on the state of engine maintenance, to perform the specified up keep thoroughly is needed. 1) Intake air System in the intake air system, care must be taken to the air cleaner. In case of oil passing type air cleaner, if the oil level is lower than the specified value, the cleaning efficiency get worse, if higher, precisely would be deviated to cause a vibration that may cause the stuck or abnormal wear by the sucked oil pollutes a case. Particularly, for if the rotor were polluted, the balance adjusted loading large force to the bearing, the perfect air cleaner must always be used.
In case of dry type filter, according to the indication of a dust indicator, cleaning must be done to make the intake air resistance as small as possible. 2) Exhaust system In exhaust system, a care must be taken to the gas leak and the stuck prevention If exhaust gas leaks from the exhaust pipe and turbocharger etc., for the super charging effect will be lowered, the installed states of various parts must be paid with careful attention.
Since the parts that reach to high temperature during operation such as the turbine room use the anti- heat nuts, a care must be paid not to mix with the general nuts and at the same time, bolt stuck preventing paint should be coated on the nut for the designated places. 3) Fuel system If the full load stopper that restricts the maximum fuel injection quantity of fuel injection pump and the maximum speed stopper that restricts the maximum speed are adjusted without the pump tester, the turbocharger may overrun to be damaged.
Also, if the atomizing state of fuel injection nozzle becomes worse or the injection timing gets wrong, for the raised temperature of exhaust gas will influence badly to the turbocharger, the nozzle testing must be done. 4) Lubricating system In the lubricating system, a care must be paid to the oil quality and oil element replacement cycle. For the oil deterioration of turbocharger equipped engine, needless to speak of engine assembly itself, influences badly to the turbocharger too, the specified engine oil (15W40, CE class) should used. Maintenance of Major Components - 136 -